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參數(shù)資料
| 型號： | TK14551V |
| 廠商： | TOKO INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | FM IF DETECTOR/AMPLIFIER |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO24 |
| 封裝： | TSSOP-24 |
| 文件頁數(shù)： | 27/32頁 |
| 文件大?。?/td> | 334K |
| 代理商： | TK14551V |
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January 2000 TOKO, Inc.
Page 27
TK14551V
CIRCUIT DESCRIPTION
Battery Save Function:
Pin 21 is the control terminal for the battery save function. The ON/OFF operation of the whole IC can be switched by
controlling the DC voltage at this terminal. Figure 14 shows the internal equivalent circuit of Pin 21.
Because it switches the bias circuit of the whole IC using the transistor in standby mode, it reduces the supply current
to near zero. As the input terminal is connected with an electrostatic discharge protection diode at GND side only, it is
possible to control the voltage above the supply voltage. It is possible to go into standby mode by disconnecting Pin 21,
but it is not recommended because Pin 21 is a high impedance and may malfunction from an external disturbance.
When Pin 21 is disconnected, a suitable capacitor should be connected between Pin 21 and GND.
FIGURE 14 - BATTERY SAVE
Application of ASK(Amplitude Shift Keying) Demodulation:
Figure 15 shows an example application of ASK demodulation.
If the application circuit is like Figure 15, the transient response time is long because of the time constant of the rectifier
(Pin 12) of the data comparator input.
On the other hand, if the circuit construction between the RSSI buffer amplifier output-2 (Pin 10) and the data comparator
input is Figure 16, the transient response time is shortened. Since the demodulation is a logarithmic detection using the
RSSI output, the demodulated wave of the RSSI buffer amplifier output-2 is distorted making the duty ratio of the data
comparator output worse. The output duty ratio may be improved by adding the offset DC voltage (Vs) to the DC voltage
of Pin 11 of the data comparator input. Vs is established at a few tens of mV. But, as the demodulation level of the RSSI
buffer amplifier output-2 is changed by the dispersion, it is best to control Vs by a variable resistor, etc. It is possible to
substitute the variable resistor for Vs.
VCC
21
50 K
BIAS
Vs
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| TK14551VTL | FM IF DETECTOR/AMPLIFIER |
| TK14552V | Wide band AM / ASK IF IC for ETC |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| TK14551V/14551 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:FM IF DETECTOR/AMPLIFIER |
| TK14551VTL | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:FM IF DETECTOR/AMPLIFIER |
| TK14552V | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:Wide band AM / ASK IF IC for ETC |
| TK14583V-G | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:Wide band FM IF IC for remote keyless entry / tire pressure monitoring system |
| TK14583VTL-G | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:Wide band FM IF IC for remote keyless entry / tire pressure monitoring system |
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